ThermoFisher Scientific HERASAFE 2025, Operating Instructions Manual

Page: 23 / 76

HERAsafe 2025 50161258 | 23
Unit Description |
Chapter 4

HEPA filters
The downflow (i.e. the air circulating within the device) and the exhaust air (air that is
released to the exterior) are cleaned by HEPA filters (HEPA = High Efficiency
Particulate Air Filter).

Safety lockout
To protect from UV radiation, the optional UV disinfection routine can be run only if
the front opening is closed. During UV disinfection, the front opening safety lockout is
activated and prevents harmful UV radiation from being emitted from the sample
chamber.
Warning system:

Airflow monitoring
Airflow monitoring determines the speed of the airflow in the sample chamber as well
as the inflow speed of the air aspired from the exterior through the working opening.
As soon as air speeds move above or below a specified safety value, a signal is
transmitted to the alarm system.

Visual and audible alarm system
The warning system constantly monitors the safety-relevant device functions:

inflow speed of the air aspired from the exterior,

downflow speed,

working position of the front window.
If the warning system detects changes to one of these device functions, it issues:

an audible and a visual alarm signal.

Position monitoring
The position sensors monitor the position of the front window; it will indicate when
the front window is in the working position.